title: Silica supported Fe(3)O(4) magnetic nanoparticles for magnetic solid-phase extraction and magnetic in-tube solid-phase microextraction: application to organophosphorous compounds.
abstract: This work demonstrates the application of silica supported Fe3O4 nanoparticles as sorbent phase for magnetic solid-phase extraction (MSPE) and magnetic on-line in-tube solid-phase microextraction (Magnetic-IT-SPME) combined with capillary liquid chromatography-diode array detection (CapLC-DAD) to determine organophosphorous compounds (OPs) at trace level. In MSPE, magnetism is used as separation tool while in Magnetic-IT-SPME, the application of an external magnetic field gave rise to a significant improvement of the adsorption of OPs on the sorbent phase. Extraction efficiency, analysis time, reproducibility and sensitivity have been compared. This work showed that Magnetic-IT-SPME can be extended to OPs with successful results in terms of simplicity, speed, extraction efficiency and limit of detection. Finally, wastewater samples were analysed to determine OPs at nanograms per litre.
authors.affiliation: Departamento de Química Analítica, Facultad de Química, Universidad de Valencia, Dr. Moliner 50, 46100, Burjassot, Valencia, Spain.
authors.forename: Y
authors.initials: Y
authors.lastname: Moliner-Martinez
authors.forename: Yosmery
authors.initials: Y
authors.lastname: Vitta
authors.forename: Helena
authors.initials: H
authors.lastname: Prima-Garcia
authors.forename: R A
authors.initials: RA
authors.lastname: González-Fuenzalida
authors.forename: Antonio
authors.initials: A
authors.lastname: Ribera
authors.forename: P
authors.initials: P
authors.lastname: Campíns-Falcó
authors.forename: Eugenio
authors.initials: E
authors.lastname: Coronado
mesh_terms: D058185:Magnetite Nanoparticles; D009943:Organophosphorus Compounds / Q000737:chemistry* / Q000302:isolation & purification; D012822:Silicon Dioxide / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D058185:Magnetite Nanoparticles; D009943:Organophosphorus Compounds; D012822:Silicon Dioxide; D062065:Wastewater; D014874:Water Pollutants, Chemical